It's not likely that he'll develop a reaction to ordinary water - his body is originally base-line human - the vampire blood toughens it up.
Vampires are technically Undead and considered a Dark/Unholy type of monster. Light, Holy or Blessed implements work best against them but some vampires have such a condensed aura, it's like throwing water on an inferno - the water evaporates before it gets close to the actual flame.
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"Focus entirely on me, you ordinary soldier."
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